I had a problem with the 5.6 Build, so rolled back months ago to the last 5.5. version. One of my clients has reported, and I have confirmed, that the default "Contact Us" page in this theme does not work (no email is sent - nothing happens - no error message).

When I tried editing the page, several tabs gave me an "Invalid Permissions" message.

Does anyone have any idea how to restore functionality to this page?

All advice appreciated. Have a great day.

Regards,
-Phil